工具類:ListPageUtil
package com.dt.user.center.util;
import java.util.Collections;
import java.util.List;
public class ListPageUtil<T> {
private List<T> data;
/** 上一頁 */
private int lastPage;
/** 當前頁 */
private int currentPage;
/** 下一頁 */
private int nextPage;
//
/** 每頁條數 */
private int pageSize;
/** 總頁數 */
private int totalPage;
/** 總數據條數 */
private int totalCount;
public ListPageUtil(List<T> data, int currentPage, int pageSize) {
if (data == null || data.isEmpty()) {
throw new IllegalArgumentException("data must be not empty!");
}
this.data = data;
this.pageSize = pageSize;
this.currentPage = currentPage;
this.totalCount = data.size();
this.totalPage = (totalCount + pageSize - 1) / pageSize;
this.lastPage = currentPage-1>1? currentPage-1:1;
this.nextPage = currentPage>=totalPage? totalPage: currentPage + 1;
}
/**
* 得到分頁後的數據
* @return 分頁後結果
*/
// public List<T> getPagedLst() {
// int fromIndex = (nowPage - 1) * pageSize;
// if (fromIndex >= data.size()) {
// return Collections.emptyList();//空數組
// }
// if(fromIndex<0){
// return Collections.emptyList();//空數組
// }
// int toIndex = nowPage * pageSize;
// if (toIndex >= data.size()) {
// toIndex = data.size();
// }
// return data.subList(fromIndex, toIndex);
// }
public int getPageSize() {
return pageSize;
}
public List<T> getData() {
int fromIndex = (currentPage - 1) * pageSize;
if (fromIndex >= data.size()) {
return Collections.emptyList();//空數組
}
if(fromIndex<0){
return Collections.emptyList();//空數組
}
int toIndex = currentPage * pageSize;
if (toIndex >= data.size()) {
toIndex = data.size();
}
return data.subList(fromIndex, toIndex);
}
public int getLastPage() {
return lastPage;
}
public int getCurrentPage() {
return currentPage;
}
public int getNextPage() {
return nextPage;
}
public int getTotalPage() {
return totalPage;
}
public int getTotalCount() {
return totalCount;
}
}
使用方式:
ListPageUtil<ParentBO> pageUtil = new ListPageUtil<>(parentBOList,parent_pageIndex, parent_pageSize);
List<ParentBO> data = pageUtil.getData();
// 其他方法參考工具類方法。